Patients receive cediranib maleate orally (PO) once daily (QD) on days 1-14 and modified FOLFOX6 comprising oxaliplatin intravenously (IV) over 2 hours, leucovorin calcium IV over 2 hours, and fluorouracil IV over 46 hours on day 1. Courses repeat every 14 days in the absence of disease progression or unacceptable toxicity.